Gastric ulcers are lesions that occur in the gastric mucosa. Ulcer disease is not contagious, therefore it does not transmit from person to person. Most gastric ulcers are caused by an infection of Helicobacter pylori, which damages the protective barrier of the gastric mucosa, and ulcers arise under the stimulation of gastric acid. The principles of treatment mainly involve eradicating Helicobacter pylori, suppressing gastric acid secretion, and protecting the gastric mucosa. Additionally, dietary control is important, including eating more vegetables and fruits, consuming less spicy and irritating foods, and paying attention to regular and measured meal times.